Forgive the intrusion, please. I need a word.

[Terrance]

Is this a trick question? 

A good question to ask your professor and respected  scholar Andrew
Delbanco. 
I believe he's written a book on the subject. 
Or James Wood. 
Or maybe our very own MalignD (Nabokov's lectures). 
A word? Novels that instruct? 
Propaganda ;-)
Try searching "Novel" AND  "Delight and Instruct", "Cause and Effect", 
"Aristotle and  Plot". 
If you're only looking for a word--didactic. 
However, I'm not sure that a book that teaches people to behave morally
can also be a novel. 
This is probably just my own opinion or just my own confusion about what
a novel is. 
See also Didactic Literature, Allegory, Courtesy Book, Exemplum, Satire. 

On the the other hand, there are explicitly didactic authors, ranging
from allegorists like Bunyan to philosophical propagandists like Sartre.
Satirists like Swift and Voltaire, though they may indulge in some
realistic effects for their own sake, will clearly sacrifice realism
whenever their satirical ends require the sacrifice. On the other hand,
many purely "mimetic" or objective writers, writers for whom the
allegation of didacticism would be distressing, also treat realism as
subordinate and functional to their special purposes. Much as Fielding
and Dickens, Trollope and Thackery may talk about their passion for
truth to nature or the real, they are often willing, as some modern
critics have complained, to sacrifice reality to tears or laughter. 

Booth, Wayne *The Rhetoric of Fiction*

Pynchon's Progress?  ...quest novels... postmodern parodies of quest and
detective
novels... encyclopedic... carnival...picaresque....

"And Isaiah the prophet cried unto the LORD: and he brought the
shadow ten degrees backward, by which it had gone down in the
dial of Ahaz." 
	- II Kings 20:11.